Scientific Forecaster Discussion

Return to Local Conditions & Forecast

Without Abbreviations
With Abbreviations

fxus66 kpdt 210446 cca 
afdpdt

Area forecast discussion...corrected
National Weather Service Pendleton or
842 PM PDT Tue Aug 20 2019

Update...
not much to speak of tonight, except increasing high clouds in
advance of an approaching cold front. Made adjustments to cloud
cover and changed winds tonight and early Wednesday based on the
latest guidance, also some minor adjustments to temps.



&&

Aviation...
06z tafs....VFR conditions through the taf period. Quiet tonight.
Winds should slowly decrease overnight but remain quite gusty at
dls. Wind will increase again on Wednesday with gusts 15 to 30 kts
possible in the afternoon and evening as a cold front crosses the
area from west to east. The best chance of any showers would be at
dls, rdm and bdn but not heavy enough to reduce ceilings or visibilities.
However, by afternoon at dls rdm, bdn, ykm and evening elsewhere a
midlevel ceiling is anticipated. Some lower ceilings are psbl, but
confidence is not high enough to forecast at this time.

&&

Previous discussion... /issued 421 PM PDT Tue Aug 20 2019/

Aviation...
00z tafs...VFR conditions to continue through tonight and into
Wednesday. Mainly high clouds tonight and early Wednesday will
thicken and lower, especially for dls, rdm and bdn with a midlevel
ceiling by afternoon. Otherwise, gusty winds will continue through the
evening before decreasing to mainly 10 kts or less. Gusts will
return on Wednesday mainly 15 t0 20 kts at PDT, bdn and rdm and up
to 25 kts at dls.

Previous discussion... /issued 133 PM PDT Tue Aug 20 2019/

Short term...tonight through Friday night...an upper level ridge of
high pressure will be over the region tonight with some high clouds
passing through the area. The ridge will move off to the east on
Wednesday as an upper level trough moves inland and pushes a cold
front through the forecast area in the afternoon and evening. Main
impact of the front will be some increasing westerly winds behind
the front. There will also be some rain showers ahead of the front
and a slight chance of thunderstorms over eastern Grant and Wallowa
counties through the evening. Cooler air will filter into the region
Wednesday night and Thursday as the upper level trough passes over
the region. There will be some lingering locally breezy conditions
Thursday along The East Slope of the Cascades. Temperatures will
begin to rebound Friday as a Dry Flat westerly flow returns.

Long term...Saturday through Tuesday...a quiet,dry pattern sets up
for the weekend and early next week. Dominant flow across the region
will be zonal/northwesterly through at least next Tuesday. This will
keep temperatures near normal with afternoon highs in the mid to
upper 80s for the lower elevations and 70s expected for the
mountains. Locally breezy winds sustained between 10-20 mph with
gusts ~30 mph are expected for Saturday and Sunday afternoon through
the Columbia River gorge, Columbia Basin, and Kittitas Valley and
will diminish heading into early next week. Richards

&&

Preliminary point temps/pops...
PDT 62 88 56 80 / 0 0 30 0
alw 63 90 60 82 / 0 0 30 10
psc 62 90 61 84 / 0 10 30 0
ykm 58 83 54 82 / 0 40 20 0
hri 63 90 57 83 / 0 10 30 0
eln 57 81 56 79 / 0 40 20 0
rdm 52 87 46 81 / 0 20 30 0
lgd 55 90 52 77 / 0 0 30 10
gcd 58 92 54 80 / 0 0 30 0
dls 61 79 59 81 / 0 40 20 0

&&

PDT watches/warnings/advisories...
or...none.
Washington...none.

National Weather Service Glossary of Abbreviations